We thank many colleagues who have assisted us in the collection of, or who have collected, blood specimens: Michael Alpers, Kuldeep Bhatia, Max Blake, Gary Dowse, Brian Hawkins, Hilary King, R.L. Kirk, George Le Gonidec, Ken Mickleson, Ruby Newlands, Ray Pace, Salam Safro, Yiping Sun, Kiki Thoma, Ron Trent, A. Veale and Paul Zimmet.